
<template>
    <view >
        <!-- 使用自定义组件 -->
        <my-search :bgcolor="'pink'" @click="gotoSearch()"></my-search>
    </view>
    <view>
        <view class="scroll-view-container">
            <!-- 左侧滑动区域 -->
            <scroll-view scroll-y="true" :style="{height: wh + 'px'}" class="left-scroll-view"  lang="scss">
                <block v-for="(item,i) in catelist" :key="i">
                    <view :class="['left-scroll-view-item', i === active ? 'active' : ' ']" @click="activeChange(i)"> {{item.cat_name}}</view>
                </block>
                
            </scroll-view>
            <!-- 右侧滑动区域 -->
            <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scropTop">
                <view class="cate-lv2" v-for="(item2,i2) in catelevel2" :key="i2">
                    <!-- 二级分类标题 -->
                    <view class="cate-lv2-title">
                        /{{item2.cat_name}}/
                    </view>
                    <!-- 二级分类下的三级分类列表 -->
                        <view class="cate-lv3-list">
                            <!-- 三级分类item项 -->
                            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodslist(item3)">
                                <!-- 三级分类的图片 -->
                                <image :src="item3.cat_icon" class="cate-lv3-item-image" ></image>
                                <!-- 三级分类的文本 -->
                                <text class="cate-lv3-item-text">{{item3.cat_name}}</text>
                            </view>
                        </view>
                    </view>
            </scroll-view>
            
        </view>
    </view>
</template>

<script>
    export default {
     
        data() {
            return {
                // 当前设备可用高度
                wh:0,
                // 获取的数据
                catelist:[],
                active : 0,
                catelevel2:[],
                scropTop:0
            }
        },
        methods: {
           async getcatelist(){
               const{data:res} = await uni.$http.get('https://api-hmugo-web.itheima.net/api/public/v1/categories')
               if (res.meta.status !== 200) return uni.$showMsg()
               this.catelist = res.message
               // 为二级分类定义
               this.catelevel2 = res.message[0].children
           },
           activeChange(i){
               this.active = i
               // 更换二级分类数据
               this.catelevel2 = this.catelist[i].children
               this.scropTop = this.scropTop === 0 ? 1 : 0
           },
           gotoGoodslist(item){
               uni.navigateTo({
                   url:'/subpkg/goods_list/goods_list?cid=' +item.cat_id
               })
           },
           gotoSearch(){
               uni.navigateTo({
                   url:'/subpkg/search/search'
               })
           }
        },
        onLoad() {
            this.getcatelist()
            // 获得当前设备的具体信息
            const sysInfo = uni.getSystemInfoSync()
             console.log((sysInfo))
             this.wh = sysInfo.windowHeight - 50
        }
    }
</script>

<style>
    
.scroll-view-container{
    display: flex;
}
.left-scroll-view{
    width: 120px;
}
.left-scroll-view-item{
    background-color: #f7f7f7;
    line-height: 60px;
    text-align: center;
    font-size: 12px;
    }
.active{
        background-color: #FFFFFF;
        position: relative;
        }
.active::before { 
                content: ' ';
                display: block;
                width:3px;
                height:30px;
                background-color: #C00000;
                position: absolute;
                top: 50%;
                left: 0;
                transform: translateY(-50%);
        
    }
.cate-lv2-title{
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
    }
.cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
}
.cate-lv3-item { 
        width: 33.33%;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        margin-bottom: 10px;
}
.cate-lv3-item-image {
            width: 33.33%;
            display: flex;
            width: 60px;
            height: 60px;
}       
.cate-lv3-item-text{
            font-size: 12px;
}
    

        
</style>
